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@bearwithme I'm going to guess moira was referring to the Dynamic Duo. Mine also disappeared 2 or 3 days ago and hasn't returned. I didn't bother mentioning anything since like you said, in this game features come and go. i.e., the Daily Quest disappeared off my game months ago and never returned, despite relatively recent forum posts indicating a few others still have it.
The Duo challenge wasn't all that important to me, but I'll miss building my streak (it vanished when I'd reached 117).